Add the relayd create session command
[lttng-tools.git] / src / common / lttng-kernel.h
1 /*
2 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * David Goulet <david.goulet@polymtl.ca>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20 #ifndef _LTTNG_KERNEL_H
21 #define _LTTNG_KERNEL_H
22
23 #include <stdint.h>
24
25 #define LTTNG_KERNEL_SYM_NAME_LEN 256
26
27 /*
28 * LTTng DebugFS ABI structures.
29 *
30 * This is the kernel ABI copied from lttng-modules tree.
31 */
32
33 enum lttng_kernel_instrumentation {
34 LTTNG_KERNEL_ALL = -1, /* Used within lttng-tools */
35 LTTNG_KERNEL_TRACEPOINT = 0,
36 LTTNG_KERNEL_KPROBE = 1,
37 LTTNG_KERNEL_FUNCTION = 2,
38 LTTNG_KERNEL_KRETPROBE = 3,
39 LTTNG_KERNEL_NOOP = 4, /* not hooked */
40 LTTNG_KERNEL_SYSCALL = 5,
41 };
42
43 enum lttng_kernel_context_type {
44 LTTNG_KERNEL_CONTEXT_PID = 0,
45 LTTNG_KERNEL_CONTEXT_PERF_COUNTER = 1,
46 LTTNG_KERNEL_CONTEXT_PROCNAME = 2,
47 LTTNG_KERNEL_CONTEXT_PRIO = 3,
48 LTTNG_KERNEL_CONTEXT_NICE = 4,
49 LTTNG_KERNEL_CONTEXT_VPID = 5,
50 LTTNG_KERNEL_CONTEXT_TID = 6,
51 LTTNG_KERNEL_CONTEXT_VTID = 7,
52 LTTNG_KERNEL_CONTEXT_PPID = 8,
53 LTTNG_KERNEL_CONTEXT_VPPID = 9,
54 LTTNG_KERNEL_CONTEXT_HOSTNAME = 10,
55 };
56
57 /* Perf counter attributes */
58 struct lttng_kernel_perf_counter_ctx {
59 uint32_t type;
60 uint64_t config;
61 char name[LTTNG_KERNEL_SYM_NAME_LEN];
62 }__attribute__((packed));
63
64 /* Event/Channel context */
65 #define LTTNG_KERNEL_CONTEXT_PADDING1 16
66 #define LTTNG_KERNEL_CONTEXT_PADDING2 LTTNG_KERNEL_SYM_NAME_LEN + 32
67 struct lttng_kernel_context {
68 enum lttng_kernel_context_type ctx;
69 char padding[LTTNG_KERNEL_CONTEXT_PADDING1];
70
71 union {
72 struct lttng_kernel_perf_counter_ctx perf_counter;
73 char padding[LTTNG_KERNEL_CONTEXT_PADDING2];
74 } u;
75 }__attribute__((packed));
76
77 struct lttng_kernel_kretprobe {
78 uint64_t addr;
79
80 uint64_t offset;
81 char symbol_name[LTTNG_KERNEL_SYM_NAME_LEN];
82 }__attribute__((packed));
83
84 /*
85 * Either addr is used, or symbol_name and offset.
86 */
87 struct lttng_kernel_kprobe {
88 uint64_t addr;
89
90 uint64_t offset;
91 char symbol_name[LTTNG_KERNEL_SYM_NAME_LEN];
92 }__attribute__((packed));
93
94 /* Function tracer */
95 struct lttng_kernel_function {
96 char symbol_name[LTTNG_KERNEL_SYM_NAME_LEN];
97 }__attribute__((packed));
98
99 #define LTTNG_KERNEL_EVENT_PADDING1 16
100 #define LTTNG_KERNEL_EVENT_PADDING2 LTTNG_KERNEL_SYM_NAME_LEN + 32
101 struct lttng_kernel_event {
102 char name[LTTNG_KERNEL_SYM_NAME_LEN];
103 enum lttng_kernel_instrumentation instrumentation;
104 char padding[LTTNG_KERNEL_EVENT_PADDING1];
105
106 /* Per instrumentation type configuration */
107 union {
108 struct lttng_kernel_kretprobe kretprobe;
109 struct lttng_kernel_kprobe kprobe;
110 struct lttng_kernel_function ftrace;
111 char padding[LTTNG_KERNEL_EVENT_PADDING2];
112 } u;
113 }__attribute__((packed));
114
115 struct lttng_kernel_tracer_version {
116 uint32_t major;
117 uint32_t minor;
118 uint32_t patchlevel;
119 }__attribute__((packed));
120
121 enum lttng_kernel_calibrate_type {
122 LTTNG_KERNEL_CALIBRATE_KRETPROBE,
123 };
124
125 struct lttng_kernel_calibrate {
126 enum lttng_kernel_calibrate_type type; /* type (input) */
127 }__attribute__((packed));
128
129 /*
130 * kernel channel
131 */
132 #define LTTNG_KERNEL_CHANNEL_PADDING1 LTTNG_SYMBOL_NAME_LEN + 32
133 struct lttng_kernel_channel {
134 uint64_t subbuf_size; /* bytes */
135 uint64_t num_subbuf; /* power of 2 */
136 unsigned int switch_timer_interval; /* usec */
137 unsigned int read_timer_interval; /* usec */
138 enum lttng_event_output output; /* splice, mmap */
139
140 int overwrite; /* 1: overwrite, 0: discard */
141 char padding[LTTNG_KERNEL_CHANNEL_PADDING1];
142 }__attribute__((packed));
143
144 #endif /* _LTTNG_KERNEL_H */
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